High-nickel ternary positive electrode material precursor and preparation method thereof
A cathode material and precursor technology, which is applied in the field of high-nickel ternary cathode material precursors and its preparation, can solve the problems of difficulty in controlling the growth of primary particle crystals and synergistic synergies
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Embodiment 1
[0027] This embodiment provides a high-nickel ternary cathode material precursor and its preparation method, the steps are as follows:
[0028] Prepare a mixed solution of 2mol / L nickel sulfate, cobalt sulfate, and manganese sulfate, the Ni:Co:Mn ratio (molar ratio, the same below) is 0.94:0.03:0.03, prepare 3mol / L ammonia water, and prepare 4mol / L hydrogen Sodium oxide solution, these three kinds of solutions are injected into the reaction kettle with stirring simultaneously respectively, add ammoniacal liquor and sodium hydroxide solution in the bottom liquid in the reaction kettle, make the pH before opening the still to be 12.5, and ammonia content is 8g / L. Adjust the injection speed of the three solutions. The initial reaction pH value is controlled at 12.3-12.5, and the ammonia content is 8-9g / L. The particle size grows to 8um and stops feeding. The precursor slurry is filtered and washed, and the filter cake is dried and sieved to obtain a dry powder.
[0029] figu...
Embodiment 2
[0038] This embodiment provides a high-nickel ternary cathode material precursor and its preparation method, the steps are as follows:
[0039] Prepare the mixed solution of nickel sulfate, cobalt sulfate, manganese sulfate of 2mol / L, Ni:Co:Mn ratio is 0.92:0.05:0.03, the ammoniacal liquor of preparation 3mol / L, the sodium hydroxide solution of preparation 4mol / L, these three The two solutions were simultaneously injected into a stirred reactor simultaneously, and ammonia water and sodium hydroxide solution were added to the bottom liquid in the reactor, so that the pH before the kettle was opened was 12.3, and the ammonia content was 8g / L. Adjust the injection speed of the three solutions, the initial reaction pH value is controlled at 12.0-12.3, the ammonia content is 8-8.5g / L, after 4 hours of reaction, the reaction pH is lowered to 11.2-11.5, and the ammonia content is reduced to 7.5-7.8g / L , until the particle size grows to 9um and stops feeding. The precursor slurry is fi...
Embodiment 3
[0041] This embodiment provides a high-nickel ternary cathode material precursor and its preparation method, the steps are as follows:
[0042] Prepare the mixed solution of nickel sulfate, cobalt sulfate, manganese sulfate of 1.5mol / L, Ni:Co:Mn ratio is 0.90:0.07:0.03, the ammoniacal liquor of preparation 3mol / L, the sodium hydroxide solution of preparation 4mol / L, this The three solutions were simultaneously injected into a stirred reactor, and ammonia water and sodium hydroxide solution were added to the bottom liquid in the reactor, so that the pH before the kettle was opened was 12.2, and the ammonia content was 7.8g / L. Adjust the injection speed of the three solutions, the initial reaction pH value is controlled at 12.0-12.2, the ammonia content is 7.8-8.0g / L, after 5 hours of reaction, the reaction pH is lowered to 11.0-11.2, and the ammonia content is reduced to 7.2-7.5g / L , until the particle size grows to 10um and stops feeding. The precursor slurry is filtered and ...
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